Recently we wanted to make an 3D-printable object on our Makerbot that filled a useful purpose. One way of finding out what to do is to analyse stuff that can be annoying and try to solve that problem.
Immediately we thought of the different ways people hang garbage bags. In most cases they get cramped into baskets or buckets which can have some disadvantages. The challenge then became to design a garbage bag holder that would be printable on our 3D printer.
You can see the result above and download the 3D files from Thingiverse.